Farrow and Ball - do you need to use their primer undercoat

[foofooyeah]

Bit of advice, I'm planning to paint my living room in estate emulsion and eggshell on the woodwork. F&B website advises to use their primer/undercoat .... It this really necessary or a way of getting you to buy more aunt?

Walls are neutral and paint I have chosen s slightly darker.
Woodwork is white over white

We haven't in the rooms we have used it and they have come up lovely.

We did some furniture and used the primer for that after a recommendation from someone and it really helped but those pieces of furniture needed about 4 or 5 coats.

Nope. On our newly plastered walls we used a mist coat made of plain white emulsion, a coat of b and q own brand emulsion that was close to the F and B colour and then 2 coats of the F&b (ammonite - a very light grey. Ditto on our mdf wardrobe doors and skirting we used an own brand primer. All fine!